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Hey i`m new to most of these things and all the phreaking tutorials and Box plans iv read deal with phone companies in the US ,What i wana know is if this information, mainly the Black box would work everyware or is each phone company different. In case your wondering im in Gibraltar and are phone company is Gibtelecom.

I have found out that when my phone rings the line is at 50-54 volts and when answer there seems to be 9 or -9v.so should the same princable apply would i be able to use a rissistor of some kind when constructing a black box